Sunday, March 19, 2006

 

Configuring Authentication and Authorization. (Question #44)

Configure a router with AAA to do the following -

  1. User with username "user1" should have password "foo1".
  2. User with username "admin" should have password "foo2".
  3. User "user1" should be able to issue the "show version" command but not the "show running" command.
  4. User "admin" should be able to issue both the "show version" command and the "show running" commands.
  5. When users attempt to log into the router , they should be prompted with the prompt "Enter username now : "
  6. The password should be prompted as "Enter password now : "
  7. User "user1" should be able to telnet to 10.10.10.10 but not to 10.10.10.1
  8. User "admin" should be able to telnet to both 10.10.10.10 and 10.10.10.1

Comments:
I am assuming that user1 can have privilege 1 as a default to be able to "show version" and that admin will need privilege 15 in order to have a complete "show run".

I couldn't find a way to modify the "Username:" login prompt so I am assuming that banner is the correct answer.

I didn't find out how to limit telnet to certain destinations based on username.

username user1 password 0 foo1
username admin privilege 15 password 0 foo2
aaa new-model
aaa authentication banner ^CEnter username now:^C
aaa authentication password-prompt "Enter password now:"
aaa authentication login default local
aaa authorization exec default local
!

line con 0
line vty 0 4
line vty 5 15
!
 
Rich, your answer is partially correct. The default is privilege 15 and so you should have explicitly specified a privilege of 1 for user "user1".

To limit telnet to certain destinations based on username, you can associate an access-class to the username in the "username" command with an accompanying ACL.

As for modifying the "Username: " prompt, in the version I am running there is an option with the "aaa authentication" command for "username-prompt". It may have been a later addition to IOS.
 
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